Walsh said the charges against Forrest would be dropped if he successfully completes the probation.

The Franklin County District Attorney's Office agreed to give Forrest accelerated rehabilitative disposition -- a type of probation in Pennsylvania that commonly is granted to first-time offenders who commit minor crimes.

"I regret what happened," Forrest said after receiving his sentence. "I just want to move forward with my life and working with the school board."

James M. Stein, Forrest's attorney, said his client's probation began Wednesday.

Forrest, 46, was pulled over Aug. 16 at 3:10 a.m. on U.S. 30 in the Borough of Chambersburg, according to Pennsylvania State Police.

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His blood-alcohol content was measured at .088 percent, court papers show. The legal limit in Pennsylvania is .08 percent.

Forrest was charged with driving under the influence, failure to stay in the lane of travel and careless driving.

Stein said Forrest's relatively low-blood alcohol played a factor in the lenient sentence.

Forrest was elected to the school board in 2000 and re-elected in 2004.

He resigned in March 2007 after he received a job promotion, but ran again in November 2008 and was elected to another four-year term.